• Proceedings of the KIPE Conference
• /
• 2018.07a
• /
• pp.495-496
• /
• 2018

본 논문은 최근 전기자동차용 충전시스템에 대한 연구개발 동향과 전망을 제시한다. 해당 기술분야의 논문 및 최근 특허출원 자료 등을 기초로 최근 국외 선진업체 및 국내 산업체 대학 연구소들의 기술개발 동향 및 기술권리화 전략을 비교 분석하였고, 이를 기초로 향후 전망 및 대책을 제시한다.

• Proceedings of the KIPE Conference
• /
• 2020.08a
• /
• pp.361-362
• /
• 2020

내연기관을 이용한 이동 수단의 환경 오염에 미치는 영향이 부각 되면서, 전기 자전거 및 전기 보드와 같이 소형 전기 자동차로 분류되는 E-Mobility에 대한 관심이 증대되고 있다. 하지만, 대중화되어 있는 EV 충전소와 달리, E-Mobile 충전 시스템은 공급이 부족한 실정이다. 따라서, 본 논문에서는 다양한 사양의 충전전압 요건을 충족하는 충전 시스템을 제안한다. 높은 범용성을 갖추기 위해 멀티 레벨 충전 시스템을 설계한다. 또한, 제안하는 충전 시스템의 PSIM 시뮬레이션 및 프로토타입을 제작하여 타당성을 검증한다.

• Journal of Electrical Engineering and Technology
• /
• v.9 no.5
• /
• pp.1602-1613
• /
• 2014

The continuous growth of electric vehicles has caused electric power shortages in conventional utilities owing to the charging of electric-vehicle batteries. In order to increase the capacity of these utilities, photovoltaic systems may be an appropriate solution because of their benefits. However, a large amount of loss is generated in a conventional charging structure using photovoltaic sources owing to the many power conversion processes. This paper describes a simple integrated battery charger that utilizes a PV generation system. Moreover, the system control algorithm is deduced by analyzing the operation modes in order to control the proposed integrated system. The proposed system and algorithm are verified by a 3.3-kW prototype, resulting in an increase in the efficiency of approximately 7% to 15% compared with the conventional system. And, to examine the feasibility of the proposed system, the simulation for multi-charger with various conditions are progressed.

• Proceedings of the KIPE Conference
• /
• 2013.11a
• /
• pp.117-118
• /
• 2013

Recent global warming to the promotion of electric vehicles (EV), plug-in hybrid (PEV), including the next generation of cars and solar power, wind power and other renewable energy, and next-generation power grid (smart grid) are getting attention. In addition, the system utilizes the battery life in the industry and the convenience of a variety of social systems, economics, environmental impact, and the inherent potential to change significantly, and you can not walk into a next-generation industrial strategy and the need increases more and more present, and its early commercialization In order to do this, as well as a key energy source, the battery charger for charging efficiency technologies is essential. In this paper, fast charge multiple battery modules and optional modules that can charge distribution charge will be introduced.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.22 no.5
• /
• pp.373-381
• /
• 2017

The electric vehicle market has increased rapidly in recent years. Established global automakers have announced that electric cars will be developed and distributed. Furthermore, current electric cars are not merely breezes, instead, they are the mainstream of automobiles. However, high prices, short mileage, and long charge times are the main obstacles to the spread of electric vehicles. To solve these problems, the competition for technology development for the expansion of electric vehicles worldwide intensifies because of the improvements in mileage, price reduction, and expansion of charging infrastructure. In this paper, the trends in the development of key technologies for electric vehicles in overseas markets and the present strategic goals for the development of key technologies for electric vehicles in Korea will be identified.

• Proceedings of the KIPE Conference
• /
• 2015.07a
• /
• pp.453-454
• /
• 2015

본 논문은 전기자동차에 탑재되는 리튬 폴리머 배터리의 고효율 충전 전략을 제시하고, 그에 따른 탑재형 충전기의 효율을 분석한다. 내부 임피던스에 의한 충전 손실을 전혀 고려하지 않는 기존의 정전류 충전방식과 대조적으로, 제안하는 방법은 배터리 내부 임피던스를 고려함으로써 충전과정의 손실을 상당량 저감할 수 있다. 본 연구의 타당성은 배터리 실험결과를 통하여 증명한다.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.20 no.4
• /
• pp.375-387
• /
• 2015

This study investigates an economic and highly efficient power-converter topology and its modulation scheme for 60 kW rapid EV charger system. The target system is a three-phase three-switch buck-type rectifier topology. A new carrier-based PWM scheme, which is characterized by simple implementation using logic gates, is introduced in this paper. This PWM scheme replaces the diode rectifier equivalent switching state with an active switching state to produce the same effective current flowing path. As a result, the distortion of input current during the polarity reversal of capacitor line voltage can be mitigated. The proposed modulation technique is confirmed through simulation verification. The proposed modulation technique and its implementation scheme can expand the operation range of the three-phase three-switch buck-type rectifier with high-quality AC input and capacitor ripple current.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.29 no.1
• /
• pp.37-46
• /
• 2015

In order to charge EVs, they have to be connected to distribution system. Therefore, if unprecedented numbers of EVs are connected to power systems, it could result in deterioration of power quality, overload, and other system problems. In this paper, the effects of voltage sag on the distribution system due to the connection of EVs is evaluated by considering related field data of Republic of Korea such as the number of gasoline-fueled vehicles, seasonal load of power system and the monthly and daily real-time traffic volume. The distribution system and EVs are modeled using the Electro Magnetic Transients Program (EMTP).

• The Transactions of the Korean Institute of Electrical Engineers P
• /
• v.67 no.3
• /
• pp.160-167
• /
• 2018

In this paper, a black box, which is provided the reliability and user safety of home battery energy storage system connected with solar energy generation, is developed. In the developed scheme, a status and diagnosis data of battery management system, power conditioning system, solar energy generation and grid is measured. This status and diagnosis data is stored and displayed in the developed black box. In addition, this status and diagnosis data is stored and displayed in a monitoring system and a smart phone of user. A performance evaluation of the developed black box is carried out using emulator of home battery energy storage system connected with solar energy generation. Consequently, the developed black box is proved its superiority of the reliability and user safety.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.23 no.5
• /
• pp.313-320
• /
• 2018

This study proposes a new voltage balancer with bidirectional DC-DC converter function. The proposed balancer can serve as a voltage balancer and a bidirectional DC-DC converter. Thus, the balancer can be applied to battery management systems or fast chargers in electric vehicles (EVs) charging stations while balancing bipolar DC bus voltages. The proposed system has unlimited voltage balancing range unlike the conventional voltage balancing control using a three-level DC-DC converter. A comparison of the voltage balancing range between the proposed and conventional scheme is explored to confirm this superiority. Simulation and experimental results are provided to validate the effectiveness of the proposed system.